- Were a series of laws passed by the Parliament of the United Kingdom that ultimately led to the creation of the Dominion of Canada in 1867.
- The first BNA Act was passed in 1867 and united the colonies of Canada, Nova Scotia, and New Brunswick into a single dominion.
- Subsequent BNA Acts, including the acts of 1871, 1886, and 1930, made revisions to the structure and governance of Canada, including the addition of new provinces and territories, the establishment of the Supreme Court of Canada, and the patriation of the Canadian Constitution.
The BNA Acts were significant in that they established the legal framework for Canada's Confederation, defined the relationship between the federal government and the provinces, and provided the basis for the country's political and constitutional system.